Asymmetric Organocatalytic Cascade Michael/Hemiketalization/Retro-Aldol Reaction of 2-[(<i>E</i>)-2-Nitrovinyl]phenols with 2,4-Dioxo-4-arylbutanoates: A Convenient Access to Chiral α-Keto Esters
unprecedented organocatalyticenantioselective cascade Michael/hemiketalization/retro‐aldol reaction of 2‐[(E)‐2‐nitrovinyl]phenols and 2,4‐dioxo‐4‐arylbutanoates is described. With a bifunctional squaramide catalyst incorporating (1R,2R)‐1,2‐diphenylethane‐1,2‐diamine, the reactions afford products in 75–99% yields with 80–98% ee. This process provides an enantioselective pathway for the synthesis of chiral
Five-membered 2,3-dioxoheterocycles: LXIV. Reactions of 1-methyl-3,4-dihydroisoquinolines with 5-arylfuran-2,3-diones and (Z)-alkyl 4-aryl-2-hydroxy-4-oxobut-2-enoates. Crystal and molecular structure of (2Z,5Z)-3-hydroxy-5-{8,8-dimethyl-2,3,8,9-tetrahydro[1,4]dioxino[2,3-g]isoquinolin-6(7H)-ylidene}-1-phenylpent-2-ene-1,4-dione
作者:V. V. Khalturina、Yu. V. Shklyaev、Z. G. Aliev、A. N. Maslivets
DOI:10.1134/s1070428009050145
日期:2009.5
5-Arylfuran-2,3-diones and (Z)-alkyl 4-aryl-2-hydroxy-4-oxobut-2-enoates react with 3,3-dialkyl-1-methyl-3,4-dihydroisoquinolines to give (2Z,5Z)-1-aryl-3-hydroxy-5-[3,3-dialkyl-3,4-dihydroisoquinolin-1(2H)-ylidene]pent-2-ene-1,4-diones whose structure has been proved by XRD analysis.
Improved preparation and structural investigation of 4-aryl-4-oxo-2-hydroxy-2-butenoic acids and methyl esters
作者:Cédric Maurin、Fabrice Bailly、Philippe Cotelle
DOI:10.1016/j.tet.2004.06.030
日期:2004.7
A simple and efficient oxalylation of aryl methyl ketones was accomplished with dimethyl oxalate in the presence of sodium methoxide. The unpreviously reported sodium ketoenolate esters were isolated and gently hydrolyzed into the ketoenol esters in good yields. Alternatively the sodium ketoenolate esters hydrolysis could also be conducted to directly afford the ketoenol acids, which represent one of the most promising class of HIV-1 integrase inhibitors. Advantages over previously reported procedures were better yields and simplicity of the purification protocol. (C) 2004 Elsevier Ltd. All rights reserved.
Kozlov, A. P.; Varkentin, L. I.; Andreichikov, Yu. S., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, p. 2002 - 2007
作者:Kozlov, A. P.、Varkentin, L. I.、Andreichikov, Yu. S.
DOI:——
日期:——
PAYARD M.; PARIS J.; COUQUELET J., TRAV. SOC. PHARM. MONTPELLIER, 1976, 36, NO 2, 115-127